PDF Labels using PHP

I am not an expert at PHP or MYSQL, but I have been able to piece together a PHP script to create a sheet of labels from a customer database. I keep getting an error.

Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource in F:\xampp\htdocs\labels.php on line 20

Warning: Cannot modify header information - headers already sent by (output started at F:\xampp\htdocs\PDF_label.php:182) in F:\xampp\htdocs\fpdf.php on line 1022
FPDF error: Some data has already been output to browser, can't send PDF file

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